Product Description
SU S9131-XL-A Poly Load Wheel Assembly for Superior electric pallet trucks: 8-inch diameter, 4-inch tread width, 97 Shore A polyurethane bonded to finished steel core, cross-compatible with Superior SU9131-XL, SU9131XL, and Crown RR5200 Series. Designed for extended heavy-duty service and harsh floor environments.
Specifications: 8.000 inch diameter x 4.000 inch width (8.000" x 4.000" | 8 x 4 wheel | 8 x 4 | 203.20mm x 101.60mm)
Specifications
Material & Construction
| Polyurethane Hardness | 97 Shore A |
| Wheel Construction | Polyurethane tread chemically bonded to steel core |
Mechanical Specifications
| Bonding Technology | XL3™ proprietary poly-steel bonding |
| Core Material | Steel, surface finished for enhanced bonding |
Part Numbers & Compatibility
| Manufacturer Part Number | SU S9131-XL-A |
| OEM Part Numbers | SU9131-XL, SU9131XL, 9131XL |
| Cross-Reference Part Numbers | Superior SU9131-XL, Superior SU9131XL, Superior 9131XL |
| Equivalent Part Numbers | L509131RA1 (Superior XL Caster) |
| Compatible Model Series | Crown RR5200 Series (RR5225-45) |
Wheel Dimensions
| Outside Diameter | 8 |
| Inside Diameter | 2.56 |
| Width Side to Side | 4 |
| Bore Depth | 0.91 |
| Bore Outside Diameter | 2.8338 |
Frequently Asked Questions
Q: What Superior and Crown electric lift trucks are compatible with the SU S9131-XL-A?
A: The SU S9131-XL-A is designed for Superior XL platform electric pallet trucks. It is also cross-compatible with Crown RR5200 Series models including the RR5225-45. Always verify your truck serial range and axle configuration against the specifications before purchasing. Not all pallet truck platforms use 8x4 wheels.
Q: What are the exact material specifications and bonding method of the SU S9131-XL-A?
A: The SU S9131-XL-A consists of a 97 Shore A polyurethane tread bonded to a finished machined steel core using the proprietary XL3 chemical bonding technology. This method provides superior heat and shear endurance compared to adhesive-only or mechanical lock designs. The combination withstands extended heavy-duty service and harsh floor environments without delamination.
Q: What part numbers can I substitute if the SU S9131-XL-A is unavailable?
A: The SU S9131-XL-A can be replaced by SU S9131-A, SU S9131-XL, or the OEM equivalent L509131RA1 Superior XL Caster. The Superior SU9131-XL, SU9131XL, and 9131XL are older designations for the same wheel. Confirm 8x4 dimensions and sealed bearing specification before substitution. Do not interchange with smaller 6x3 or larger 10x5 wheels.
Q: How do I diagnose if a SU S9131-XL-A wheel needs replacement?
A: Listen for grinding or metal-on-metal noise during truck operation (bearing failure). Observe flat spots, chunks, or severe cracks in the polyurethane tread. Check for side-to-side play or axial wobble on the axle. Spin the wheel by hand; it should rotate smoothly for 8-10 seconds without resistance. Any of these conditions require immediate replacement to prevent axle damage and truck downtime.
Q: What is the installation and torque specification for the SU S9131-XL-A?
A: Remove the axle cotter pin or fastener. Slide the SU S9131-XL-A wheel assembly onto the axle until the bearing inner race seats fully against the shoulder. Reinstall the cotter pin, axle nut, or clip, ensuring the wheel spins freely without axial play (typical tolerance is 0.005 to 0.015 inches). If axle fastener has a torque specification, consult your truck manual (typically 25-35 foot-pounds for standard axles). Verify rotation before placing truck in service.